When should I consider referring a patient to advanced life support (ALS) services following a cardiac arrest?

Guideline-aligned answer with reasoning, red flags and references. Clinically reviewed by Dr Kola Tytler MBBS CertHE MBA MRCGP.

Posted: 22 August 2025Updated: 22 August 2025 Guideline-Aligned (High Confidence) Clinically Reviewed
Dr Kola Tytler MBBS CertHE MBA MRCGPClinical Lead • iatroX

Consider referring a patient to advanced life support (ALS) services immediately following a cardiac arrest if:

  • The patient has a suspected or confirmed acute coronary syndrome (ACS) with ongoing or recurrent chest pain, as this may indicate a life-threatening cardiac event requiring urgent hospital care and advanced resuscitation measures .
  • There is evidence of cardiac arrest or life-threatening arrhythmias detected on ECG or clinical assessment, necessitating advanced airway management, defibrillation, and advanced circulatory support ,.
  • The patient is unresponsive or has no effective circulation after initial basic life support measures, indicating the need for escalation to ALS interventions ,.
  • Any red flags such as conduction abnormalities, ventricular arrhythmias, or other ECG changes suggestive of severe cardiac instability are present, warranting urgent specialist assessment and ALS referral .

In all cases, do not delay transfer to hospital or ALS services while performing diagnostic tests such as ECGs; immediate referral and initiation of ALS is critical to improve outcomes after cardiac arrest ,.

Related Knowledge Topics

Educational content only. Always verify information and use clinical judgement.